agra 5648337749 ffi #jni_main: accept #jni_main as Android entry; modern smoke shape ...

Loosens lower.zig's `checkRequiredEntryPoints` to accept either a
`#jni_main #jni_class("...")` decl OR the legacy `android_main`
trampoline. The diagnostic now shows both options when neither is
present.

Updates the slice 2 smoke (`examples/ffi-jni-main-01-emit.sx`) to
express the modern shape — drops `android_main`, declares
`Bundle :: #foreign #jni_class("android/os/Bundle")`, and overrides
`onCreate :: (self: *Self, b: *Bundle) { }` inside the #jni_main class.
The emitted Java now correctly declares `void onCreate(Bundle b)` as
@Override + a matching `private native void sx_onCreate(Bundle b)`
delegate, verified via dexdump.

Full retirement of `android_main` (deleting native_app_glue from the
Android link path, dropping `AndroidPlatform.run_frame_loop`, migrating
chess/EGL demo to the Java-driven lifecycle) is multi-slice rework
and stays as follow-up.

2026-05-20 14:50:21 +03:00

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